Machine for mortising blinds



Uwrrenfrafrns BENJ. T. Nonnis, or LYNN, MASSACHUSETTS.

MACHINE FOR ivloRrlsl-Ne- BLINDS.

Specitlcation forming part of Letters Patent No. 12,691. dated April 10, 1855.

To all 'whom't't may concern:

Be itknown that I, BENJAMIN T. NORRIS, of Lynn, inthe county of Essex and State of Massachusetts, have invented a new and useful Machine for Making the Shade-Mortises in `Blinds; fand I do hereby declare that the fol` lowing is a full, clear, and exact description ofthe construction and operation of the same, reference being had to the annexed drawings, making a part of this specilicatiou, in which- Figure l is a perspective View". Fig. 2 is a plan view; Fig. 3, a view of the cutting-tool and its appendages; Fig. 4, a longitudinal section of the cutting-tool; Fig. 5, a 4transverse section of the same.

The sameletters refer to the similar parts of the machine in dilierent drawings.

A is the frame of the machine; B, aframe or platform sliding on the frame A, and carry- 4ing with it the piece ot' Stock to be mortised.

C is the piece of stock to be mortised. It is fixed on the frame B by means of an adjustable tenon 'fitting within the end-rail mortises.- It is further kept in place by Ithe rollers a a, one of which presses on the top, the other against the side, of the stock by means of springs in the arms b b.

The stock and the appendages for keeping the same in place have beenomitted on the near Sidein Fig. 1. l

D is a handle and lever, attached to the stationary frame A, for moving forward the frame B and the piece to be mortised. The motion is etfected by the intervention of the ratchet C, operating upon a rack lixed upon the frameB. The lmotion of the frame B, with thev part of .the blind to be mortised, and consequently the distances of the mortises from each other, are" determined by the index E, into' which the detents d and e fall. Y The detents d and e are intended severally for'the two sets or series of mortises each side ot the central-rail mortise.

(Only one is attached to the model accompany` the index by being connected to the rack h by a rod orchain. They are to some extent movable in a groove in the frame B to accommodate the machine to different lengths in spacing of the shade-mortises.

The rack h is operated by the backward mo= tion of the handle D through the intervention of the ratchet g. On moving forward the han- (lle D (with frame B, stock, &c.,) the detent passes over a division ot' the index, after which the ratchet g rises from the rack h, leaving it free to be drawn forward b`y a spring for that purpose, thus depressing the detents upon the index and checking the motion of the stock iu a proper position to receive the mortise.

Having thus described those parts of my machine intendedV for'moving and regulating the piece to be mortised, I will now explain those parts intended forcuttin g the mortise.

. a n are .two drills, hits, or cutters to which a rapid rotary motion is given. They have also a traverse motion corresponding to the direction and length of the mortise to be cut. `The cutters are mounted upon a carriage, I, which slides in a frame, H. The frame His hinged at the top to the frame of the machine,land the lower end can be altered to vary the inclination or Obliquity of the mortise. The length of the mortise iS determined by the screws m m. The cutters receive their rotary motion from the belt O, passing around the pulley J and driving-pulley K. The pulley J (see Figs. 4, and 5) is bored or hollow in its axis to receive the spindle S. The spindle Sis made in two portions, the inner ends of which are halved, so as to tit each other and turn together, and at the saine time move freely and steadily upon each other in a longitudinal direction. They are made to turn with the pulley J by means of a pin ixed in the pulley. This pin works in a slot cut in the ends of the spindles, leaving them free to move in the direction of their length. The cutters n a are scooped out their whole length, and are confined in their places by a small screw. As the cutters wear off or break a fresh portion may he drawn out and again confined by the same means. The cutters are thrown outward from the pulley by means of the levers P P. The outer ends of the spindles, being grooved, receive a collar, Vto which the ends of the levers P P are attached (see Fig. 3) by pivots.k Levers are`op ernted by the handle and screw L through the intervention 0f the Y, which has pins working in slots in the en ds ot' the bars. This method of operating' the cutters I have adopted in preference to the device of the two handles shown in Fig, caveat drawings.

The manner ot' operating# my machine is its follows: The stoel; being` lixed upon the frame B by means ofthe adjustable tenons, the handle D is drawn back, thus raising the detent from the index. It is then pushed forward until the frame is stopped bythe index. The screw L is then turned so ns to depress the pperends of the levers P l), thus throwing out the cuttersn u to a proper distance for the depth ot' the niortise. lt is then drawn up so us to traverse the whole length ot the mortise7 when e backward motion ot' the screw withdraws the cutters from the stock, and the frame upon which the cutters are mounted slides down by its own weight, and is ready for another mortise, when the stock is again placed in the proper position.

The principle and operation ol my machine having been thus stated, I desire to claim as my own invention- 1. The manner ot' constructing and operating the parts carrying the same-viz., the hollow pulle)7 and spindle within the semearranged as described, together with the levers attached, operated by the means described7 or other suitable device.

2. The manner of operating and guiding the stock by the combination 0i' the lever with the racks and the movable detente, as herein desci ihed, but do not chiiin the index constructed of bars, .its described, that having been in use before.

BENJAMIN T. NORRIS.

Witnesses:

THO. B. NEWHALL, J UsTiN H. HATCH. 

